Which instrument shows the engine's current temperature?

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Engine temperature is shown by the temperature gauge. This gauge indicates the coolant temperature in real time, so you can tell whether the engine is warming up to its normal operating range or running hot. A normal range means the engine is cooling properly and operating safely. If the needle climbs toward hot or a warning light comes on, it signals possible overheating, and you should pull over safely to check the situation or seek assistance. The other instruments measure different things: the odometer tracks total miles driven, the tachometer shows engine RPM, and the fuel gauge shows how much fuel remains. The temperature gauge is the one that specifically tells you how hot the engine is right now. Some cars may use a digital readout or a warning light, but the purpose remains the same.